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空频自适应处理(SFAP)是全球导航卫星系统(GNSS)阵列抗干扰接收机中常用的算法,而工程实践中,阵列的幅相不一致性是必须考虑的非理想因素。以往文献分析阵列各通道幅相不一致性的影响多集中于波束形成和波达角(DOA)估计的精度上。该文在SFAP算法框架下,结合已知的各通道传递函数,计算观测数据协方差矩阵和最优权矢量,进而可获得SFAP抗干扰性能损失程度的定量结果。计算和仿真结果表明:通道幅相不一致性可严重影响SFAP抗干扰性能。该方法在工程上可用于确定射频通道幅相一致性指标要求。
Space-frequency adaptive processing (SFAP) is a commonly used algorithm in global navigation satellite system (GNSS) array anti-jamming receivers. In engineering practice, the inconsistency of the array amplitude is a non-ideal factor that must be considered. In the past, the influence of amplitude and phase inconsistencies in each channel of the array was mainly focused on the accuracy of beamforming and DOA estimation. In the framework of SFAP algorithm, combined with the known transfer function of each channel, the covariance matrix and the optimal weight vector of the observed data are calculated, and the quantitative results of the degree of anti-jamming performance loss of SFAP can be obtained. The calculation and simulation results show that the channel amplitude and phase inconsistency can seriously affect the anti-jamming performance of SFAP. This method can be used in engineering to determine the amplitude and phase consistency of the RF channel.